Why H3PO3 is a diprotic acid? Give reason with structure .

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Meaning of diprotic acid is that , it can loose two hydronium ions (H+) .

For finding how many H+ ions it can give , we have to see its structure.

Here it have only two hydroxyl groups that is -OH groups, and the hydrogen atoms joined to these only are ionisable. So only these can be released as H+ ions. And the acid is diprotic acid.

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